ALS on an EA82T

[joostvdw]

This is purely hypothetical, because I have no need for it and no need to damage my turbo either, but I just wanted to discuss it here.

 

As far as I k now all an ALS (anti-lag system) does is retard ignition timing and inject fuel when you're off the throttle between shifts. The enrichend mixture ignites in the manifold uppipe and keeps the turbo up to speed (and thus boost).

 

Alright, injection fuel is not to hard to do, just make a timer circuit (555 anyone?) with the right duty cycle. Sensing you're off throttle is not that hard either, just use the idle switch or mount a seperate switch.

But you don't want the ALS kicking in when you're idleing, so, you need a way to sense that. By using the RPM signal, you can use a high-pass filter (RC circuit) to sense you're above 3000rpm (or any other rpm you like), and use those two sensor inputs in a AND circuit.

 

Last but not least you need to retard the ignition. I'm not 100% sure on this, but I would think one can just put a RC circuit on the signal side of the coil and this retard it. Who's knows?

 

Anyway, just kicking this around, I got bored during college and thought this up. There will most likely be a mistake somewhere, as it seems way to simple to me

[Ross]

Sounds about right..... You may not need to offset the coil input manually though - the turbo ones have an ignition retard function already, all you need to do is trick it..... although I'm not sure how far this will let you retard it - how much is needed? I'd guess quite a bit, but it would depend on your fuel, combustion chamer temperature etc.

 

As you say, the electronics side of it is simple..... but getting it to work well might be a different story..... you might just end up pouring a whole lot of unburnt petrol out the exhaust......

[Numbchux]

AFAIK, fuel 'timing' is the same. making the injector fire later won't help, because the intake valve will be closed.....

 

the only difference is the ignition timing. you just make that plug not spark for that cycle until the exhaust valve is open.

 

this would actually be quite difficult with a distributer. as by the time the exhaust valve is open, the distributer rotor has moved beyond that cylinder's point on the cap.....and thus, it won't fire.

 

 

you'd need a way to intercept the ignition signal between the disty and the plug, and then fire that plug a bit later.

 

 

I don't see a way to do it while keeping a disty

 

if you go megasquirt or other standalone, you could probably harvest the coil pack and ignitor from an early EJ engine, and hook that up without too much difficulty though...

[daeron]

 

if you go megasquirt or other standalone, you could probably harvest the coil pack and ignitor from an early EJ engine, and hook that up without too much difficulty though...

 

 

Or use the stock dizzy for the CAS to signal an EDIS system pulled of a 4 cylinder ford.... again, with MS..